Electric motor.



No. 640,747. Patented Jan. 9, 1900.

0. F. couxuu.

ELECTRIC MOTOR.

(Application filed Apr. 24, 1899.)

(No Model.)

a @511 amen/w WM a/dw UNITED STATES PATENT OFFICE.

OLIVER F. OONKLIN, OF SPRINGFIELD, OHIO.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 640,747, dated January9, 1900.

Application filed April 24, 1899. Serial No. 714,158, (No model.)

T0 to whom it may concern.-

Be it known that I, OLIVER F. CONKLIN, a citizen of the United States,residing at Springfield, in the county of Clark and State of Ohio, haveinvented certain new and useful Improvements in Electric Motors, ofwhich the following is a specification.

My invention relates to improvements in electric motors, and especiallyrelates to the field-magnets and constructions therefor.

In the accompanying drawings, Figure 1 is a plan View showing a deviceembodying my invention. Fig. 2 is a detail of the same, illustrating themanner of placing the coil in position on the magnet-core. Fig. 3 is anelevation showing the magnet complete.

Like parts are represented by similar letters of reference in theseveral views.

In constructing my improved motor I employ a circuit-ring a, of metal,with which there are formed integrally the metallic cores a. Each ofthese cores is formed with a long pole-piece a and a short pole-piece aThe coil 6, which surrounds the core a, is seated in the usual way uponthe core; but by rea son of the peculiar shape of the pole-pieces a andan l am enabled to wind this coil separate from the core and to hook thesame over the core and pole-pieces, as shown in Fig. 2, after the coilis complete. By the construc tion thus shown it will be seen that Iobtain a motor in which the magnetic circuit is maintained at thehighest efficiency, all of the parts being integral. I am thus enabledto reduce the cores to the minimum, while by 1 reason of the extendedpole-pieces a I secure the proper electromagnetic field for the armatureand at the same time by having the long and short pole-pieces, asdescribed, the field may be easily and simply constructed by winding thecoil first and crowding it over the short pole-piece after the same hasbeen hooked on the long pole-piece, as shown in Fig. 2.

Having thus described my invention, I claim In an electric motor, ametallic supportingring integrally formed with T-shaped heads, saidheads being formed with one long and one short pole andseparately-formed coils adapted to be hooked over the long pole andpressed into position over the short pole, whereby the said coils areheld in place on the said pole pieces wholly by the projecting polesextending in opposite directions, substantially as specified.

In testimony whereof I have hereunto set my hand this 19th day of April,A. D. 1899.

OLIVER F. OONKLIN.

Witnesses:

OHAs. I. WELCH, EARL G. WELOH.

